高级程序员修炼之道-Android培训系列课程之Thread

android
android andriod Handler Looper Handler Android Looper android UI Handle Handle Handle Looper UI Looper
UI UI UI
Android Looper android UI Handler Handler Handler Looper UI Looper
UI UI UI
Handler Handler
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class ChildThread extends Thread {
public void run() {
/*
* handler Looper.
*/
Looper.prepare();
/*
* handler
*
*/
mChildHandler = new Handler() {
public void handleMessage(Message msg) {
/*
* Do some expensive operations there.
*/
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9 } }; /* * */ Looper.loop(); } }
Handler handleMessage(…)
quit() ?
mChildHandler.getLooper().quit
();
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1 8 /**
*
* @author allin.dev
*
*
*/
public class MainThread extends Activity {
private static final String TAG = "MainThread";
private Handler mMainHandler, mChildHandler;
private TextView info;
private Button msgBtn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(yout.main);
info = (TextView) findViewById();
msgBtn = (Button) findViewById(R.id.msgBtn);
mMainHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
Log.i(TAG, "Got an incoming message from the child thread - " + (String) msg.obj);
//
info.setText((String) msg.obj);
}
};
new ChildThread().start();
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39 4msgBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (mChildHandler != null) { // Message childMsg = mChildHandler.obtainMessage(); childMsg.obj = mMainHandler.getLooper().getThread().getName() + " says Hello"; mChildHandler.sendMessage(childMsg); Log.i(TAG, "Send a message to the child thread - " + (String)childMsg.obj); } } }); } public void onDestroy() { super.onDestroy(); Log.i(TAG, "Stop looping the child thread's message queue"); mChildHandler.getLooper().quit(); } class ChildThread extends Thread { private static final String CHILD_TAG = "ChildThread"; public void run() { this.setName("ChildThread"); // Handler Looper.prepare(); mChildHandler = new Handler() { @Override public void handleMessage(Message msg) { Log.i(CHILD_TAG, "Got an incoming message from the main thread - " + (String)msg.obj); try { // sleep(100); Message toMain = mMainHandler.obtainMessage(); toMain.obj = "This is " + this.getLooper().getThread().getName() + ". Did you send me \"" + (String)msg.obj + "\"?"; mMainHandler.sendMessage(toMain); Log.i(CHILD_TAG, "Send a message to the main thread - " + (String)toMain.obj); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } }
};
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Log.i(CHILD_TAG, "Child handler is bound to - "+ mChildHandler.getLooper().getThread().getName()); // Looper.loop(); } } }
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08。